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Balticoceras : ウィキペディア英語版 | Balticoceras
''Balticoceras'' is a genus in the Orthocerid family, Orthoceratidae, from the Upper Ordovician of Estonia, closely related to ''Michelinoceras''. ''Balticoceras'' is distinguished by its straight shells with a subcircular cross section, broadly flattened ventrally and evenly rounded dorsally, and by its marginal, orthochoanitic siphuncle. ''Balticoceras'' which is included in the subfamily Michelinoceratinae along with ''Michelinoceras'' should not be confused with ''Baltoceras'' which belongs in the Ellesmerocerida. ==''References''==
* Walter C. Sweet 1964. Nautiloidea- Orthocerida. Treatise on Invertebrate Paleontology, Part K. Teichert and Moore (eds)
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